diff --git a/src/frontend/vectors.c b/src/frontend/vectors.c
index 95273c3e1..57c4f07bb 100644
--- a/src/frontend/vectors.c
+++ b/src/frontend/vectors.c
@@ -1138,6 +1138,7 @@ vec_mkfamily(struct dvec *v)
          * of these things...
          */
         d->v_numdims = 1;
+        d->v_dims[0] = size;
         d->v_length = size;
 
         if (isreal(v)) {